/
ck_archive.go
369 lines (347 loc) · 10.2 KB
/
ck_archive.go
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package business
import (
"database/sql"
"fmt"
"github.com/colinmarc/hdfs/v2"
"github.com/housepower/ckman/common"
"github.com/housepower/ckman/log"
"github.com/pkg/errors"
"os"
"path"
"path/filepath"
"strings"
"sync"
"sync/atomic"
"time"
)
const (
HdfsUserDefault string = "root"
MaxFileSizeDefault int = 1e10
CKDatabaseDefault string = "default"
ParallelismDefault int = 4
DateLayout string = "2006-01-02"
DateTimeLayout string = "2006-01-02 15:04:05"
SlotTimeFormat string = "20060102150405"
)
type ArchiveHDFS struct {
Hosts []string
Port int
User string
Password string
Database string
Tables []string
Begin string
End string
MaxFileSize int
HdfsAddr string
HdfsUser string
HdfsDir string
Parallelism int
Pool *common.WorkerPool
}
var (
tryDateIntervals = []string{"1 year", "1 month", "1 week", "1 day"}
tryDateTimeIntervals = []string{"1 year", "1 month", "1 week", "1 day", "4 hour", "1 hour"}
pattInfo map[string][]string // table -> Date/DateTime column, type
wg sync.WaitGroup
cntErrors int32
estSize uint64
hdfsDir []string
)
func (this *ArchiveHDFS) FillArchiveDefault() {
if this.HdfsUser == "" {
this.HdfsUser = HdfsUserDefault
}
if this.MaxFileSize == 0 {
this.MaxFileSize = MaxFileSizeDefault
}
if this.Database == "" {
this.Database = CKDatabaseDefault
}
if this.Parallelism == 0 {
this.Parallelism = ParallelismDefault
}
}
func (this *ArchiveHDFS) InitConns() (err error) {
for _, host := range this.Hosts {
if len(host) == 0 {
continue
}
_, err = common.ConnectClickHouse(host, this.Port, this.Database, this.User, this.Password)
if err != nil {
err = errors.Wrapf(err, "")
return
}
log.Logger.Infof("initialized clickhouse connection to %s", host)
}
return
}
func (this *ArchiveHDFS) GetSortingInfo() (err error) {
pattInfo = make(map[string][]string)
for _, table := range this.Tables {
var name, typ string
for _, host := range this.Hosts {
db := common.GetConnection(host)
if db == nil {
return fmt.Errorf("can't get connection: %s", host)
}
var rows *sql.Rows
query := fmt.Sprintf("SELECT name, type FROM system.columns WHERE database='%s' AND table='%s' AND is_in_partition_key=1 AND type IN ('Date', 'DateTime')", this.Database, table)
log.Logger.Infof("host %s: query: %s", host, query)
if rows, err = db.Query(query); err != nil {
err = errors.Wrapf(err, "")
return
}
defer rows.Close()
for rows.Next() {
if name != "" {
err = errors.Errorf("table %s has multiple Date/DateTime columns in sorting key", table)
return
}
if err = rows.Scan(&name, &typ); err != nil {
err = errors.Wrapf(err, "")
return
}
pattInfo[table] = []string{name, typ}
}
if name != "" {
break
}
}
}
return
}
// https://www.slideshare.net/databricks/the-parquet-format-and-performance-optimization-opportunities
// P22 sorted data helps to predicate pushdown
// P25 avoid many small files
// P27 avoid few huge files - 1GB?
func (this *ArchiveHDFS) GetSlots(host, table string) (slots []time.Time, err error) {
var sizePerRow float64
var rowsCnt uint64
var compressed uint64
// get size-per-row
if rowsCnt, err = this.SelectUint64(host, fmt.Sprintf("SELECT count() FROM %s", table)); err != nil {
return
}
if rowsCnt == 0 {
return
}
if compressed, err = this.SelectUint64(host, fmt.Sprintf("SELECT sum(data_compressed_bytes) AS compressed FROM system.parts WHERE database='%s' AND table='%s' AND active=1", this.Database, table)); err != nil {
return
}
sizePerRow = float64(compressed) / float64(rowsCnt)
maxRowsCnt := uint64(float64(this.MaxFileSize) / sizePerRow)
slots = make([]time.Time, 0)
var slot time.Time
db := common.GetConnection(host)
if db == nil {
log.Logger.Errorf("can't get connection:%s", host)
return
}
colName := pattInfo[table][0]
colType := pattInfo[table][1]
var totalRowsCnt uint64
if totalRowsCnt, err = this.SelectUint64(host, fmt.Sprintf("SELECT count() FROM %s WHERE `%s`>=%s AND `%s`<%s", table, colName, formatDate(this.Begin, colType), colName, formatDate(this.End, colType))); err != nil {
return
}
tblEstSize := totalRowsCnt * uint64(sizePerRow)
log.Logger.Infof("host %s: totol rows to export: %d, estimated size (in bytes): %d", host, totalRowsCnt, tblEstSize)
atomic.AddUint64(&estSize, tblEstSize)
sqlTmpl3 := "SELECT toStartOfInterval(`%s`, INTERVAL %s) AS slot, count() FROM %s WHERE `%s`>=%s AND `%s`<%s GROUP BY slot ORDER BY slot"
var tryIntervals []string
if colType == "Date" {
tryIntervals = tryDateIntervals
} else {
tryIntervals = tryDateTimeIntervals
}
for i, interval := range tryIntervals {
slots = slots[:0]
var rows1 *sql.Rows
query1 := fmt.Sprintf(sqlTmpl3, colName, interval, table, colName, formatDate(this.Begin, colType), colName, formatDate(this.End, colType))
log.Logger.Infof("host %s: query: %s", host, query1)
if rows1, err = db.Query(query1); err != nil {
err = errors.Wrapf(err, "")
return
}
defer rows1.Close()
var tooBigSlot bool
LOOP_RS:
for rows1.Next() {
if err = rows1.Scan(&slot, &rowsCnt); err != nil {
err = errors.Wrapf(err, "")
return
}
if rowsCnt > maxRowsCnt && i != len(tryIntervals)-1 {
tooBigSlot = true
break LOOP_RS
}
slots = append(slots, slot)
}
if !tooBigSlot {
break
}
}
return
}
func (this *ArchiveHDFS) Export(host, table string, slots []time.Time) {
var err error
for i := 0; i < len(slots); i++ {
var slotBeg, slotEnd time.Time
slotBeg = slots[i]
if i != len(slots)-1 {
slotEnd = slots[i+1]
} else {
if slotEnd, err = time.Parse(DateLayout, this.End); err != nil {
panic(fmt.Sprintf("BUG: failed to parse %s, layout %s", this.End, DateLayout))
}
}
this.ExportSlot(host, table, i, slotBeg, slotEnd)
}
}
func (this *ArchiveHDFS) ExportSlot(host, table string, seq int, slotBeg, slotEnd time.Time) {
colName := pattInfo[table][0]
colType := pattInfo[table][1]
_ = this.Pool.Submit(func() {
hdfsTbl := "hdfs_" + table + "_" + slotBeg.Format(SlotTimeFormat)
for _, dir := range hdfsDir {
fp := filepath.Join(dir, host+"_"+slotBeg.Format(SlotTimeFormat)+".parquet")
queries := []string{
fmt.Sprintf("DROP TABLE IF EXISTS %s", hdfsTbl),
fmt.Sprintf("CREATE TABLE %s AS %s ENGINE=HDFS('hdfs://%s%s', 'Parquet')", hdfsTbl, table, this.HdfsAddr, fp),
fmt.Sprintf("INSERT INTO %s SELECT * FROM %s WHERE `%s`>=%s AND `%s`<%s", hdfsTbl, table, colName, formatTimestamp(slotBeg, colType), colName, formatTimestamp(slotEnd, colType)),
fmt.Sprintf("DROP TABLE %s", hdfsTbl),
}
db := common.GetConnection(host)
if db == nil {
log.Logger.Errorf("can't get connection: %s", host)
return
}
for _, query := range queries {
if atomic.LoadInt32(&cntErrors) != 0 {
return
}
log.Logger.Infof("host %s, table %s, slot %d, query: %s", host, table, seq, query)
if _, err := db.Exec(query); err != nil {
log.Logger.Errorf("host %s: got error %+v", host, err)
atomic.AddInt32(&cntErrors, 1)
return
}
}
log.Logger.Infof("host %s, table %s, slot %d, export done", host, table, seq)
}
})
this.Pool.Wait()
}
func (this *ArchiveHDFS) ClearHDFS() error {
var err error
this.Pool = common.NewWorkerPool(this.Parallelism, len(this.Hosts))
ops := hdfs.ClientOptions{
Addresses: []string{this.HdfsAddr},
User: this.HdfsUser,
}
var hc *hdfs.Client
if hc, err = hdfs.NewClient(ops); err != nil {
err = errors.Wrapf(err, "")
log.Logger.Errorf("got error %+v", err)
return err
}
slotBeg, _ := time.Parse(DateLayout, this.Begin)
slotEnd, _ := time.Parse(DateLayout, this.End)
for _, table := range this.Tables {
dir := path.Join(this.HdfsDir, table)
hdfsDir = append(hdfsDir, dir)
_ = hc.Mkdir(dir, 0777)
var fileList []os.FileInfo
if fileList, err = hc.ReadDir(dir); err != nil {
err = errors.Wrapf(err, "")
log.Logger.Errorf("got error %+v", err)
return err
}
for _, file := range fileList {
name := file.Name()
if !strings.Contains(name, "parquet") {
continue
}
slot := strings.Split(strings.TrimSuffix(name, ".parquet"), "_")[1]
slotTime, err := time.Parse(SlotTimeFormat, slot)
if err != nil {
log.Logger.Errorf("parse time error: %+v", err)
return err
}
if (slotTime.After(slotBeg) || slotTime.Equal(slotBeg)) && slotTime.Before(slotEnd) {
filePath := path.Join(dir, name)
if err = hc.Remove(filePath); err != nil {
err = errors.Wrapf(err, "")
log.Logger.Errorf("got error %+v", err)
return err
}
}
}
log.Logger.Infof("cleared hdfs directory %s", dir)
}
return nil
}
func (this *ArchiveHDFS) ExportToHDFS() (err error) {
t0 := time.Now()
for i := 0; i < len(this.Hosts); i++ {
host := this.Hosts[i]
wg.Add(1)
go func() {
defer wg.Done()
var slots []time.Time
for _, table := range this.Tables {
if slots, err = this.GetSlots(host, table); err != nil {
log.Logger.Errorf("host %s: got error %+v", host, err)
return
}
this.Export(host, table, slots)
}
}()
}
wg.Wait()
if atomic.LoadInt32(&cntErrors) != 0 {
log.Logger.Errorf("export failed")
return err
} else {
du := uint64(time.Since(t0).Seconds())
size := atomic.LoadUint64(&estSize)
msg := fmt.Sprintf("exported %d bytes in %d seconds", size, du)
if du != 0 {
msg += fmt.Sprintf(", %d bytes/s", size/du)
}
log.Logger.Infof(msg)
}
return nil
}
func formatDate(dt, typ string) string {
if typ == "DateTime" {
return fmt.Sprintf("parseDateTimeBestEffort('%s')", dt)
}
return fmt.Sprintf("'%s'", dt)
}
func formatTimestamp(ts time.Time, typ string) string {
if typ == "DateTime" {
return fmt.Sprintf("'%s'", ts.Format(DateTimeLayout))
}
return fmt.Sprintf("'%s'", ts.Format(DateLayout))
}
func (this *ArchiveHDFS) SelectUint64(host, query string) (res uint64, err error) {
db := common.GetConnection(host)
if db == nil {
log.Logger.Errorf("can't get connection:%s", host)
return
}
var rows *sql.Rows
log.Logger.Infof("host %s: query: %s", host, query)
if rows, err = db.Query(query); err != nil {
err = errors.Wrapf(err, "")
return
}
defer rows.Close()
rows.Next()
if err = rows.Scan(&res); err != nil {
err = errors.Wrapf(err, "")
return
}
return
}